Abstract
The critical acceleration model plays an important role in seismic slope stability and determines the predictive accuracy of regional seismic landslide hazard assessments. Recently, the critical acceleration model based on the limit equilibrium method has been used to evaluate the seismic stability of regional slopes. However, when the Hoek-Brown failure criterion is used to evaluate the seismic stability of slopes with angles greater than 60°, the results obtained is unconservative by limit equilibrium method. Therefore, based on the simulation of a typical slope model with finite element limit analysis, prediction equations of the critical acceleration are established. The corresponding results are compared with the prediction results from the limit equilibrium method. This comparison shows that the proposed critical acceleration model has higher predictive accuracy than the limit equilibrium method, especially when the Hoek-Brown failure criterion is used to evaluate the slopes with angles greater than 60°. The proposed model is applicable to the global scope and can be effectively applied to regional seismic landslide hazard assessments.
Highlights
Earthquakes have induced a large number of landslides, which buried towns and farmland and damaged infrastructure, causing substantial economic losses and casualties in the disaster area (Qi et al, 2010; Xu et al, 2015; Chen et al, 2018; Fan et al, 2018)
The proposed model can be effectively applied to regional seismic landslide hazard assessments
Our model improves the limitations of previous mechanical models for regional seismic landslide hazard assessments
Summary
Earthquakes have induced a large number of landslides, which buried towns and farmland and damaged infrastructure, causing substantial economic losses and casualties in the disaster area (Qi et al, 2010; Xu et al, 2015; Chen et al, 2018; Fan et al, 2018). 4) the modified models have obvious advantages in predicting the potential sliding area These mechanical models provide a new perspective for regional earthquake landslide hazard assessments, they are still not sufficiently comprehensive as they have the following shortcomings. A modified model of the critical acceleration for regional seismic landslide hazard assessments is proposed based on the work of Saade et al (2016) to overcome the limitations of the above mechanical models. In this model, finite element limit analysis (FELA) is used to build a simplified slope model, and the material strength parameter and slope angle are taken as variables to conduct simulations of the slopes. The proposed model can be effectively applied to regional seismic landslide hazard assessments
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